Method of mechanically producing alpha bunch-shaped hollow rib in the back plate of artificial teeth



Jan. 26, 1932. KREUZEDER 1,842,678

METHOD OF MECHANICALLY PRODUCING A BUNCH SHAPED HOLLOW RIB IN THE BACK PLATE OF ARTIFICIAL TEETH Filed act. 4, 1950 //7 vemon:

Karl Kreuzacler.

Amrnm Patented Jan. 26, 1932 UNITED STATES"? OFFICE KARL KREUZEDER, F BERCHTESGADEN, GERMANY METHUJD or MECHANIGALLY rnonocnve annncn snnrnn HoLLow an; IN THE neon PLATE or nnrrrrcmnrnern Application filed October 4, 1930, Serial no The present invention relates to a method of producing back-plates for artificial teeth.

upon the rib of the plate in the longitudinab 1o direction of the rib and secured thereon, whilst its plane back supports to the plane face of the back plate.

The manufacture of these back plates was very circumstantially hitherto, and they are produced up to present by the specialists partially by casting the same, where it is necessary, to make at first a corresponding mould. According to another method of manufac ture the plate is rolled together with the rib as a profiled bar, from which then the single back plates are cut off. One part of the bar then must be severed still from the plate itself. These bars are very solid indeed, but because the artificial teeth are of very diffcrent size, it is necessary to keep a good stock of such bars in hand, or to work a uniformly manufactured plate so that it is adjusted to the teeth in question. Because the back plates are made in the most cases of gold of 10 high value, the keeping of such a stock is involved with large expenses. Furthermore this method gives many chips which may be recovered only by melting down.

It has also already become known to manufacture back plates for teeth by the aid of flat nose pliers, having a mouth the width of which is equal to the height of the plate to be made and having transversely to the mouth on the one side a rib and on the other side a notch. By the use of such flat nose pliers it is, however, only possible to produce a bunch in the plate to be Worked extending over the whole height of the plate. This hunch is then pressed together from the sides so that a round rib is formed. This procedure has the disadvantage that afterwards a portion of the rib must be removed again, so that a slot is formed in the plate which must be closed again by soldering.

These disadvantages shall be obviated by .486-,297,--a11d in Germany December 6,1928.

the method according: to .theinvention and representedin the annexed" drawings.

:A'lhemethod consists inthat at first bunch of a length =corresponding to the .ban "to be 'EIJI'OdUCGd; is pressed from the plane plate, as shown in F igi 1, ilreeping during thisrtime w-the otherportiono'f the plate under flat presl sure.- The bunch pressed out 'ofthe :plane of thewpltlte will then be pressedtogethen in zknownimanner from the sides,so that the 'finalrshape is formed. according to" Fig; 2. wWith asufficient degree "of ability itis posi sible to accommodate the form of thefriloz to r'the .form of thenotch of the bodyof tooth to be put up by pressing the rib moreaorlessout :Of' the plane ofthe plate and by pressing together moremr less the two walls-of therrib. An additional Working is scarcely necessary. In this-manner the finalwzbaok platemayi be wproducedi in' shortmtime separately for each tooth to be inserted, sothat the keeping of an expensive stock is "not necessary;

":If sheets =ofrsmall: thickness, for; instance to. 0,3 mm. are used; it is preferable: to insert a correspondingly thick core of steel or gold i wire-before r pressing i laterally 1 together the U-shaped rib in such a;=manner that thebunch surroundsqahdihdlds fast the wire after the pressing process.

For accomplishing this method preferably flat nose pliers as shown in Fig. 3 are used. The rib a arranged on one side of the mouth fits together with the free play dependent from the thickness of the sheet of metal into the notch b of the other part of the mouth,- so that if the flat nose pliers will be closed a U-shaped rib is pressed out from the sheet of metal in the mouth of the flat nose pliers, as shown in Fig. 1. At a certain distance from one or both of the outer edges the fiat nose pliers are provided with notches If the plate formed according to Fig. 1 is laid laterally into the mouth of the pliers and these are pressed together, the edges 0 press firmly together the rib, Whilst within the groove formed by the notches 2' the bunch-shaped head of the rib is formed (Fig. 2).

In practice it has been found that the flat main portion of the plate shown in Figure 1, when the U-shaped rib is compressed to form the tubular head as shown in Figure 2, will not be disfigured or bent at all or to a Very slight degree only. In case of such a slight disfiguration of the plate, however a light pressure or tapping on the plate while still firmly held between the plier jaws-Will be sufiicient to remedy the defect and remove the bend or bulge. The metallic material of which the plate is made is so ductile as to not only withstand'the comparatively vigorous dilatation at the closed end of the rib due to'the bulging operation or'effect, but also prevents bulging or bending of the plate near the closed end of the rib at the subsequent operation of forming the tubular head.

What I claim is 1. Method for mechanically producing a bunch-shaped hollow rib in the back plates for artificial teeth with a corresponding notch on their back part consisting in pressing out from a plane sheet of metal-a hollow rib extending in the longitudinal direction of the" said metal sheet but only over apart of the length of the back plate,- whilst the other part protruding over said rib is kept under flat pressure, whereupon both side-walls of the so that the cross section of the head of the a rib are pressed together in known manner rib has more or less the formof anapproximately closed circle. r 2; Flat-nose pliers for accomplishing the I said process with'a rib on one plier and a corresponding notch in the other plier, said rib andnotch extending only over a portion of said pliers and leaving free the other-portion of the same, serving for exerting during portion of the back-plate to be worked which. 7 extends over the hollow rib, produced in said plate.

the pressingoperation a flat pressure on that 7 name to this specification.

KARL KREUZEDER. 

